The Standard Model of Particles and Interactions. Ian Hinchliffe 26 June 2002. What is the World Made of?. Ancient times – 4 elements 19 th century – atoms Early 20 th century – electrons, protons, neutrons Today – quarks and leptons. The Atom in 1900.
26 June 2002
Most are unstable
Proton and electron are stable
Neutron can decay to electron and a proton
Energy appears to be missing. It is carried off by a neutrinoParticles can decay